Evidence map›Paper›PMID 26726924›Full record

ArticleJournal of the American Chemical Society2016

Concise Total Synthesis of (+)-Asperazine, (+)-Pestalazine A, and (+)-iso-Pestalazine A. Structure Revision of (+)-Pestalazine A.

Richard P Loach, Owen S Fenton, Mohammad Movassaghi

Abstract read
In one paragraph

Article in Journal of the American Chemical Society, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

16 citing papers in PubMed.

  1. Concise Synthesis of Cyctetryptomycin A and B Enabled by Zr-Catalyzed Dimerization.Angewandte Chemie (International ed. in English) · 2025
    Article
  2. Article
  3. Article
  4. Total synthesis of complex 2,5-diketopiperazine alkaloids.The Alkaloids. Chemistry and biology · 2023
    Review
  5. Article
  6. Article
  7. Article
  8. Review
  9. Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Review
  15. Article
  16. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors.

Richard P LoachDepartment of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
Owen S FentonDepartment of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
Mohammad MovassaghiDepartment of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.

Funding

Synthesis and Study of Dimeric Diketopiperazine AlkaloidsR01GM089732 · NIGMS · MASSACHUSETTS INSTITUTE OF TECHNOLOGY · PI MOVASSAGHI, MOHAMMAD · 2010 to 2021
$4.6M
NIGMS NIH HHS GM089732NIGMS NIH HHS R01 GM089732
6 · The paper itself

Abstract

The concise, enantioselective total syntheses of (+)-asperazine (1), (+)-iso-pestalazine A (2), and (+)-pestalazine A (3) have been achieved by the development of a late-stage C3-C8' Friedel-Crafts union of polycyclic diketopiperazines. Our modular strategy enables the union of complex polycyclic diketopiperazines in virtually their final forms, thus providing rapid and highly convergent assembly at the challenging quaternary stereocenter of these dimeric alkaloids. The significance of this carbon-carbon bond formation can be gauged by the manifold constraints that were efficiently overcome, namely the substantial steric crowding at both reactive sites, the nucleophilic addition of C8' over N1' to the C3 carbocation, and the multitude of reactivity posed by the use of complex diketopiperazine fragments in the coupling event. The success of the indoline π-nucleophile that evolved through our studies is notable given the paucity of competing reaction pathways observed in the presence of the highly reactive C3 carbocation generated. This first total synthesis of (+)-pestalazine A also allowed us to revise the molecular structure for this natural alkaloid.

Indexed as

DiketopiperazinesIndole AlkaloidsIndolesMolecular ConformationPiperazinesStereoisomerismasperazineDiketopiperazinesIndole AlkaloidsIndolesiso-pestalazine Apestalazine APiperazines

Identifiers

PMID26726924
PMCPMC4908971

What OpenQuestion holds

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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.